iconvdata/jis0208.h

   1 /* Access functions for JISX0208 conversion.
   2    Copyright (C) 1997-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _JIS0208_H
  21 #define _JIS0208_H      1
  22
  23 #include <gconv.h>
  24 #include <stdint.h>
  25
  26 /* Struct for table with indices in UCS mapping table.  */
  27 struct jisx0208_ucs_idx
  28 {
  29   uint16_t start;
  30   uint16_t end;
  31   uint16_t idx;
  32 };
  33
  34
  35 /* Conversion table.  */
  36 extern const uint16_t __jis0208_to_ucs[];
  37
  38 #define JIS0208_LAT1_MIN 0xa2
  39 #define JIS0208_LAT1_MAX 0xf7
  40 extern const char __jisx0208_from_ucs4_lat1[JIS0208_LAT1_MAX + 1
  41                                             - JIS0208_LAT1_MIN][2];
  42 extern const char __jisx0208_from_ucs4_greek[0xc1][2];
  43 extern const struct jisx0208_ucs_idx __jisx0208_from_ucs_idx[];
  44 extern const char __jisx0208_from_ucs_tab[][2];
  45
  46
  47 static inline uint32_t
  48 __attribute ((always_inline))
  49 jisx0208_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
  50 {
  51   unsigned char ch = *(*s);
  52   unsigned char ch2;
  53   int idx;
  54
  55   if (ch < offset || (ch - offset) <= 0x20)
  56     return __UNKNOWN_10646_CHAR;
  57
  58   if (avail < 2)
  59     return 0;
  60
  61   ch2 = (*s)[1];
  62   if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
  63     return __UNKNOWN_10646_CHAR;
  64
  65   idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
  66   if (idx >= 0x1e80)
  67     return __UNKNOWN_10646_CHAR;
  68
  69   (*s) += 2;
  70
  71   return __jis0208_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
  72 }
  73
  74
  75 static inline size_t
  76 __attribute ((always_inline))
  77 ucs4_to_jisx0208 (uint32_t wch, unsigned char *s, size_t avail)
  78 {
  79   unsigned int ch = (unsigned int) wch;
  80   const char *cp;
  81
  82   if (avail < 2)
  83     return 0;
  84
  85   if (ch >= JIS0208_LAT1_MIN && ch <= JIS0208_LAT1_MAX)
  86     cp = __jisx0208_from_ucs4_lat1[ch - JIS0208_LAT1_MIN];
  87   else if (ch >= 0x391 && ch <= 0x451)
  88     cp = __jisx0208_from_ucs4_greek[ch - 0x391];
  89   else
  90     {
  91       const struct jisx0208_ucs_idx *rp = __jisx0208_from_ucs_idx;
  92
  93       if (ch >= 0xffff)
  94         return __UNKNOWN_10646_CHAR;
  95       while (ch > rp->end)
  96         ++rp;
  97       if (ch >= rp->start)
  98         cp = __jisx0208_from_ucs_tab[rp->idx + ch - rp->start];
  99       else
 100         return __UNKNOWN_10646_CHAR;
 101     }
 102
 103   if (cp[0] == '\0')
 104     return __UNKNOWN_10646_CHAR;
 105
 106   s[0] = cp[0];
 107   s[1] = cp[1];
 108
 109   return 2;
 110 }
 111
 112 #endif /* jis0208.h */